Commit | Line | Data |
---|---|---|
284e0531 | 1 | /* seh pdata/xdata coff object file format |
82704155 | 2 | Copyright (C) 2009-2019 Free Software Foundation, Inc. |
284e0531 KT |
3 | |
4 | This file is part of GAS. | |
5 | ||
6 | GAS is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GAS is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GAS; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA | |
19 | 02110-1301, USA. */ | |
20 | ||
987499b2 KT |
21 | #include "obj-coff-seh.h" |
22 | ||
987499b2 | 23 | |
2d7f4929 KT |
24 | /* Private segment collection list. */ |
25 | struct seh_seg_list { | |
26 | segT seg; | |
27 | int subseg; | |
28 | char *seg_name; | |
29 | }; | |
30 | ||
987499b2 | 31 | /* Local data. */ |
987499b2 KT |
32 | static seh_context *seh_ctx_cur = NULL; |
33 | ||
2d7f4929 KT |
34 | static struct hash_control *seh_hash; |
35 | ||
36 | static struct seh_seg_list *x_segcur = NULL; | |
37 | static struct seh_seg_list *p_segcur = NULL; | |
681418c2 RH |
38 | |
39 | static void write_function_xdata (seh_context *); | |
40 | static void write_function_pdata (seh_context *); | |
604ab327 | 41 | |
681418c2 | 42 | \f |
2d7f4929 KT |
43 | /* Build based on segment the derived .pdata/.xdata |
44 | segment name containing origin segment's postfix name part. */ | |
45 | static char * | |
46 | get_pxdata_name (segT seg, const char *base_name) | |
987499b2 | 47 | { |
2d7f4929 KT |
48 | const char *name,*dollar, *dot; |
49 | char *sname; | |
50 | ||
51 | name = bfd_get_section_name (stdoutput, seg); | |
52 | ||
53 | dollar = strchr (name, '$'); | |
54 | dot = strchr (name + 1, '.'); | |
55 | ||
56 | if (!dollar && !dot) | |
57 | name = ""; | |
58 | else if (!dollar) | |
59 | name = dot; | |
60 | else if (!dot) | |
61 | name = dollar; | |
62 | else if (dot < dollar) | |
63 | name = dot; | |
64 | else | |
65 | name = dollar; | |
66 | ||
67 | sname = concat (base_name, name, NULL); | |
68 | ||
69 | return sname; | |
70 | } | |
71 | ||
72 | /* Allocate a seh_seg_list structure. */ | |
73 | static struct seh_seg_list * | |
74 | alloc_pxdata_item (segT seg, int subseg, char *name) | |
75 | { | |
76 | struct seh_seg_list *r; | |
77 | ||
78 | r = (struct seh_seg_list *) | |
79 | xmalloc (sizeof (struct seh_seg_list) + strlen (name)); | |
80 | r->seg = seg; | |
81 | r->subseg = subseg; | |
82 | r->seg_name = name; | |
83 | return r; | |
84 | } | |
85 | ||
86 | /* Generate pdata/xdata segment with same linkonce properties | |
87 | of based segment. */ | |
88 | static segT | |
89 | make_pxdata_seg (segT cseg, char *name) | |
90 | { | |
91 | segT save_seg = now_seg; | |
92 | int save_subseg = now_subseg; | |
93 | segT r; | |
94 | flagword flags; | |
95 | ||
96 | r = subseg_new (name, 0); | |
97 | /* Check if code segment is marked as linked once. */ | |
98 | flags = bfd_get_section_flags (stdoutput, cseg) | |
99 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD | |
100 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE | |
101 | | SEC_LINK_DUPLICATES_SAME_CONTENTS); | |
102 | ||
103 | /* Add standard section flags. */ | |
104 | flags |= SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA; | |
105 | ||
106 | /* Apply possibly linked once flags to new generated segment, too. */ | |
107 | if (!bfd_set_section_flags (stdoutput, r, flags)) | |
108 | as_bad (_("bfd_set_section_flags: %s"), | |
109 | bfd_errmsg (bfd_get_error ())); | |
110 | ||
111 | /* Restore to previous segment. */ | |
112 | subseg_set (save_seg, save_subseg); | |
113 | return r; | |
987499b2 KT |
114 | } |
115 | ||
987499b2 | 116 | static void |
2d7f4929 KT |
117 | seh_hash_insert (const char *name, struct seh_seg_list *item) |
118 | { | |
119 | const char *error_string; | |
120 | ||
121 | if ((error_string = hash_jam (seh_hash, name, (char *) item))) | |
122 | as_fatal (_("Inserting \"%s\" into structure table failed: %s"), | |
123 | name, error_string); | |
124 | } | |
125 | ||
126 | static struct seh_seg_list * | |
127 | seh_hash_find (char *name) | |
987499b2 | 128 | { |
2d7f4929 KT |
129 | return (struct seh_seg_list *) hash_find (seh_hash, name); |
130 | } | |
131 | ||
132 | static struct seh_seg_list * | |
133 | seh_hash_find_or_make (segT cseg, const char *base_name) | |
134 | { | |
135 | struct seh_seg_list *item; | |
136 | char *name; | |
137 | ||
138 | /* Initialize seh_hash once. */ | |
139 | if (!seh_hash) | |
140 | seh_hash = hash_new (); | |
141 | ||
142 | name = get_pxdata_name (cseg, base_name); | |
143 | ||
144 | item = seh_hash_find (name); | |
145 | if (!item) | |
681418c2 | 146 | { |
2d7f4929 KT |
147 | item = alloc_pxdata_item (make_pxdata_seg (cseg, name), 0, name); |
148 | ||
149 | seh_hash_insert (item->seg_name, item); | |
681418c2 RH |
150 | } |
151 | else | |
2d7f4929 KT |
152 | free (name); |
153 | ||
154 | return item; | |
155 | } | |
156 | ||
bea2c1d7 KT |
157 | /* Check if current segment has same name. */ |
158 | static int | |
159 | seh_validate_seg (const char *directive) | |
160 | { | |
161 | const char *cseg_name, *nseg_name; | |
162 | if (seh_ctx_cur->code_seg == now_seg) | |
163 | return 1; | |
164 | cseg_name = bfd_get_section_name (stdoutput, seh_ctx_cur->code_seg); | |
165 | nseg_name = bfd_get_section_name (stdoutput, now_seg); | |
166 | as_bad (_("%s used in segment '%s' instead of expected '%s'"), | |
167 | directive, nseg_name, cseg_name); | |
168 | ignore_rest_of_line (); | |
169 | return 0; | |
170 | } | |
171 | ||
3c6256d2 NC |
172 | /* Switch back to the code section, whatever that may be. */ |
173 | static void | |
174 | obj_coff_seh_code (int ignored ATTRIBUTE_UNUSED) | |
175 | { | |
176 | subseg_set (seh_ctx_cur->code_seg, 0); | |
177 | } | |
178 | ||
2d7f4929 KT |
179 | static void |
180 | switch_xdata (int subseg, segT code_seg) | |
181 | { | |
182 | x_segcur = seh_hash_find_or_make (code_seg, ".xdata"); | |
183 | ||
184 | subseg_set (x_segcur->seg, subseg); | |
185 | } | |
186 | ||
187 | static void | |
188 | switch_pdata (segT code_seg) | |
189 | { | |
190 | p_segcur = seh_hash_find_or_make (code_seg, ".pdata"); | |
191 | ||
192 | subseg_set (p_segcur->seg, p_segcur->subseg); | |
681418c2 RH |
193 | } |
194 | \f | |
195 | /* Parsing routines. */ | |
987499b2 | 196 | |
681418c2 RH |
197 | /* Return the style of SEH unwind info to generate. */ |
198 | ||
199 | static seh_kind | |
200 | seh_get_target_kind (void) | |
201 | { | |
202 | if (!stdoutput) | |
203 | return seh_kind_unknown; | |
204 | switch (bfd_get_arch (stdoutput)) | |
987499b2 | 205 | { |
681418c2 RH |
206 | case bfd_arch_arm: |
207 | case bfd_arch_powerpc: | |
208 | case bfd_arch_sh: | |
209 | return seh_kind_arm; | |
210 | case bfd_arch_i386: | |
211 | switch (bfd_get_mach (stdoutput)) | |
987499b2 | 212 | { |
681418c2 RH |
213 | case bfd_mach_x86_64: |
214 | case bfd_mach_x86_64_intel_syntax: | |
215 | return seh_kind_x64; | |
216 | default: | |
217 | break; | |
987499b2 | 218 | } |
681418c2 RH |
219 | /* FALL THROUGH. */ |
220 | case bfd_arch_mips: | |
221 | return seh_kind_mips; | |
222 | case bfd_arch_ia64: | |
223 | /* Should return seh_kind_x64. But not implemented yet. */ | |
224 | return seh_kind_unknown; | |
987499b2 KT |
225 | default: |
226 | break; | |
227 | } | |
681418c2 | 228 | return seh_kind_unknown; |
987499b2 KT |
229 | } |
230 | ||
681418c2 RH |
231 | /* Verify that we're in the context of a seh_proc. */ |
232 | ||
233 | static int | |
234 | verify_context (const char *directive) | |
987499b2 | 235 | { |
681418c2 | 236 | if (seh_ctx_cur == NULL) |
987499b2 | 237 | { |
681418c2 RH |
238 | as_bad (_("%s used outside of .seh_proc block"), directive); |
239 | ignore_rest_of_line (); | |
240 | return 0; | |
987499b2 | 241 | } |
681418c2 RH |
242 | return 1; |
243 | } | |
987499b2 | 244 | |
681418c2 | 245 | /* Similar, except we also verify the appropriate target. */ |
987499b2 | 246 | |
681418c2 RH |
247 | static int |
248 | verify_context_and_target (const char *directive, seh_kind target) | |
249 | { | |
250 | if (seh_get_target_kind () != target) | |
987499b2 | 251 | { |
681418c2 RH |
252 | as_warn (_("%s ignored for this target"), directive); |
253 | ignore_rest_of_line (); | |
254 | return 0; | |
255 | } | |
256 | return verify_context (directive); | |
257 | } | |
258 | ||
259 | /* Skip whitespace and a comma. Error if the comma is not seen. */ | |
260 | ||
261 | static int | |
262 | skip_whitespace_and_comma (int required) | |
263 | { | |
264 | SKIP_WHITESPACE (); | |
265 | if (*input_line_pointer == ',') | |
266 | { | |
267 | input_line_pointer++; | |
268 | SKIP_WHITESPACE (); | |
269 | return 1; | |
987499b2 | 270 | } |
681418c2 RH |
271 | else if (required) |
272 | { | |
273 | as_bad (_("missing separator")); | |
274 | ignore_rest_of_line (); | |
275 | } | |
276 | else | |
277 | demand_empty_rest_of_line (); | |
278 | return 0; | |
987499b2 KT |
279 | } |
280 | ||
681418c2 | 281 | /* Mark current context to use 32-bit instruction (arm). */ |
1e17085d | 282 | |
987499b2 | 283 | static void |
681418c2 | 284 | obj_coff_seh_32 (int what) |
987499b2 | 285 | { |
681418c2 RH |
286 | if (!verify_context_and_target ((what ? ".seh_32" : ".seh_no32"), |
287 | seh_kind_arm)) | |
288 | return; | |
604ab327 | 289 | |
681418c2 RH |
290 | seh_ctx_cur->use_instruction_32 = (what ? 1 : 0); |
291 | demand_empty_rest_of_line (); | |
292 | } | |
293 | ||
294 | /* Set for current context the handler and optional data (arm). */ | |
295 | ||
296 | static void | |
297 | obj_coff_seh_eh (int what ATTRIBUTE_UNUSED) | |
298 | { | |
299 | if (!verify_context_and_target (".seh_eh", seh_kind_arm)) | |
987499b2 | 300 | return; |
681418c2 RH |
301 | |
302 | /* Write block to .text if exception handler is set. */ | |
303 | seh_ctx_cur->handler_written = 1; | |
304 | emit_expr (&seh_ctx_cur->handler, 4); | |
305 | emit_expr (&seh_ctx_cur->handler_data, 4); | |
306 | ||
307 | demand_empty_rest_of_line (); | |
987499b2 KT |
308 | } |
309 | ||
681418c2 RH |
310 | /* Set for current context the default handler (x64). */ |
311 | ||
987499b2 | 312 | static void |
681418c2 | 313 | obj_coff_seh_handler (int what ATTRIBUTE_UNUSED) |
987499b2 | 314 | { |
681418c2 RH |
315 | char *symbol_name; |
316 | char name_end; | |
317 | ||
318 | if (!verify_context (".seh_handler")) | |
987499b2 | 319 | return; |
681418c2 RH |
320 | |
321 | if (*input_line_pointer == 0 || *input_line_pointer == '\n') | |
322 | { | |
323 | as_bad (_(".seh_handler requires a handler")); | |
324 | demand_empty_rest_of_line (); | |
325 | return; | |
326 | } | |
327 | ||
328 | SKIP_WHITESPACE (); | |
329 | ||
330 | if (*input_line_pointer == '@') | |
987499b2 | 331 | { |
d02603dc | 332 | name_end = get_symbol_name (&symbol_name); |
681418c2 RH |
333 | |
334 | seh_ctx_cur->handler.X_op = O_constant; | |
335 | seh_ctx_cur->handler.X_add_number = 0; | |
336 | ||
337 | if (strcasecmp (symbol_name, "@0") == 0 | |
338 | || strcasecmp (symbol_name, "@null") == 0) | |
339 | ; | |
340 | else if (strcasecmp (symbol_name, "@1") == 0) | |
341 | seh_ctx_cur->handler.X_add_number = 1; | |
342 | else | |
343 | as_bad (_("unknown constant value '%s' for handler"), symbol_name); | |
344 | ||
d02603dc | 345 | (void) restore_line_pointer (name_end); |
987499b2 | 346 | } |
681418c2 RH |
347 | else |
348 | expression (&seh_ctx_cur->handler); | |
987499b2 | 349 | |
681418c2 RH |
350 | seh_ctx_cur->handler_data.X_op = O_constant; |
351 | seh_ctx_cur->handler_data.X_add_number = 0; | |
352 | seh_ctx_cur->handler_flags = 0; | |
353 | ||
354 | if (!skip_whitespace_and_comma (0)) | |
987499b2 KT |
355 | return; |
356 | ||
681418c2 | 357 | if (seh_get_target_kind () == seh_kind_x64) |
987499b2 | 358 | { |
681418c2 | 359 | do |
987499b2 | 360 | { |
d02603dc | 361 | name_end = get_symbol_name (&symbol_name); |
681418c2 RH |
362 | |
363 | if (strcasecmp (symbol_name, "@unwind") == 0) | |
364 | seh_ctx_cur->handler_flags |= UNW_FLAG_UHANDLER; | |
365 | else if (strcasecmp (symbol_name, "@except") == 0) | |
366 | seh_ctx_cur->handler_flags |= UNW_FLAG_EHANDLER; | |
367 | else | |
368 | as_bad (_(".seh_handler constant '%s' unknown"), symbol_name); | |
369 | ||
d02603dc | 370 | (void) restore_line_pointer (name_end); |
987499b2 | 371 | } |
681418c2 RH |
372 | while (skip_whitespace_and_comma (0)); |
373 | } | |
374 | else | |
375 | { | |
376 | expression (&seh_ctx_cur->handler_data); | |
377 | demand_empty_rest_of_line (); | |
378 | ||
379 | if (seh_ctx_cur->handler_written) | |
380 | as_warn (_(".seh_handler after .seh_eh is ignored")); | |
381 | } | |
382 | } | |
383 | ||
384 | /* Switch to subsection for handler data for exception region (x64). */ | |
385 | ||
386 | static void | |
387 | obj_coff_seh_handlerdata (int what ATTRIBUTE_UNUSED) | |
388 | { | |
389 | if (!verify_context_and_target (".seh_handlerdata", seh_kind_x64)) | |
390 | return; | |
391 | demand_empty_rest_of_line (); | |
392 | ||
2d7f4929 | 393 | switch_xdata (seh_ctx_cur->subsection + 1, seh_ctx_cur->code_seg); |
681418c2 RH |
394 | } |
395 | ||
396 | /* Mark end of current context. */ | |
397 | ||
398 | static void | |
399 | do_seh_endproc (void) | |
400 | { | |
401 | seh_ctx_cur->end_addr = symbol_temp_new_now (); | |
402 | ||
403 | write_function_xdata (seh_ctx_cur); | |
404 | write_function_pdata (seh_ctx_cur); | |
405 | seh_ctx_cur = NULL; | |
406 | } | |
407 | ||
408 | static void | |
409 | obj_coff_seh_endproc (int what ATTRIBUTE_UNUSED) | |
410 | { | |
411 | demand_empty_rest_of_line (); | |
412 | if (seh_ctx_cur == NULL) | |
413 | { | |
414 | as_bad (_(".seh_endproc used without .seh_proc")); | |
415 | return; | |
416 | } | |
bea2c1d7 | 417 | seh_validate_seg (".seh_endproc"); |
681418c2 RH |
418 | do_seh_endproc (); |
419 | } | |
420 | ||
421 | /* Mark begin of new context. */ | |
422 | ||
423 | static void | |
424 | obj_coff_seh_proc (int what ATTRIBUTE_UNUSED) | |
425 | { | |
426 | char *symbol_name; | |
427 | char name_end; | |
428 | ||
429 | if (seh_ctx_cur != NULL) | |
430 | { | |
431 | as_bad (_("previous SEH entry not closed (missing .seh_endproc)")); | |
432 | do_seh_endproc (); | |
433 | } | |
434 | ||
435 | if (*input_line_pointer == 0 || *input_line_pointer == '\n') | |
436 | { | |
437 | as_bad (_(".seh_proc requires function label name")); | |
438 | demand_empty_rest_of_line (); | |
439 | return; | |
440 | } | |
441 | ||
442 | seh_ctx_cur = XCNEW (seh_context); | |
443 | ||
2d7f4929 KT |
444 | seh_ctx_cur->code_seg = now_seg; |
445 | ||
681418c2 RH |
446 | if (seh_get_target_kind () == seh_kind_x64) |
447 | { | |
2d7f4929 KT |
448 | x_segcur = seh_hash_find_or_make (seh_ctx_cur->code_seg, ".xdata"); |
449 | seh_ctx_cur->subsection = x_segcur->subseg; | |
450 | x_segcur->subseg += 2; | |
987499b2 | 451 | } |
681418c2 RH |
452 | |
453 | SKIP_WHITESPACE (); | |
454 | ||
d02603dc | 455 | name_end = get_symbol_name (&symbol_name); |
681418c2 | 456 | seh_ctx_cur->func_name = xstrdup (symbol_name); |
d02603dc | 457 | (void) restore_line_pointer (name_end); |
681418c2 RH |
458 | |
459 | demand_empty_rest_of_line (); | |
460 | ||
461 | seh_ctx_cur->start_addr = symbol_temp_new_now (); | |
987499b2 KT |
462 | } |
463 | ||
681418c2 RH |
464 | /* Mark end of prologue for current context. */ |
465 | ||
466 | static void | |
467 | obj_coff_seh_endprologue (int what ATTRIBUTE_UNUSED) | |
468 | { | |
bea2c1d7 KT |
469 | if (!verify_context (".seh_endprologue") |
470 | || !seh_validate_seg (".seh_endprologue")) | |
681418c2 RH |
471 | return; |
472 | demand_empty_rest_of_line (); | |
473 | ||
474 | if (seh_ctx_cur->endprologue_addr != NULL) | |
475 | as_warn (_("duplicate .seh_endprologue in .seh_proc block")); | |
476 | else | |
477 | seh_ctx_cur->endprologue_addr = symbol_temp_new_now (); | |
478 | } | |
479 | ||
480 | /* End-of-file hook. */ | |
481 | ||
987499b2 KT |
482 | void |
483 | obj_coff_seh_do_final (void) | |
484 | { | |
681418c2 | 485 | if (seh_ctx_cur != NULL) |
804a4093 | 486 | as_bad (_("open SEH entry at end of file (missing .seh_endproc)")); |
987499b2 KT |
487 | } |
488 | ||
681418c2 RH |
489 | /* Enter a prologue element into current context (x64). */ |
490 | ||
987499b2 | 491 | static void |
681418c2 | 492 | seh_x64_make_prologue_element (int code, int info, offsetT off) |
987499b2 KT |
493 | { |
494 | seh_prologue_element *n; | |
604ab327 | 495 | |
987499b2 KT |
496 | if (seh_ctx_cur == NULL) |
497 | return; | |
498 | if (seh_ctx_cur->elems_count == seh_ctx_cur->elems_max) | |
499 | { | |
987499b2 | 500 | seh_ctx_cur->elems_max += 8; |
681418c2 RH |
501 | seh_ctx_cur->elems = XRESIZEVEC (seh_prologue_element, |
502 | seh_ctx_cur->elems, | |
503 | seh_ctx_cur->elems_max); | |
987499b2 | 504 | } |
681418c2 RH |
505 | |
506 | n = &seh_ctx_cur->elems[seh_ctx_cur->elems_count++]; | |
507 | n->code = code; | |
508 | n->info = info; | |
509 | n->off = off; | |
510 | n->pc_addr = symbol_temp_new_now (); | |
987499b2 KT |
511 | } |
512 | ||
681418c2 RH |
513 | /* Helper to read a register name from input stream (x64). */ |
514 | ||
987499b2 | 515 | static int |
681418c2 | 516 | seh_x64_read_reg (const char *directive, int kind) |
987499b2 | 517 | { |
681418c2 | 518 | static const char * const int_regs[16] = |
604ab327 NC |
519 | { "rax", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi", |
520 | "r8","r9","r10","r11","r12","r13","r14","r15" }; | |
681418c2 | 521 | static const char * const xmm_regs[16] = |
604ab327 NC |
522 | { "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", |
523 | "xmm8", "xmm9", "xmm10","xmm11","xmm12","xmm13","xmm14","xmm15" }; | |
681418c2 RH |
524 | |
525 | const char * const *regs = NULL; | |
987499b2 KT |
526 | char name_end; |
527 | char *symbol_name = NULL; | |
528 | int i; | |
529 | ||
987499b2 | 530 | switch (kind) |
604ab327 NC |
531 | { |
532 | case 0: | |
604ab327 | 533 | case 1: |
681418c2 | 534 | regs = int_regs; |
604ab327 NC |
535 | break; |
536 | case 2: | |
681418c2 | 537 | regs = xmm_regs; |
604ab327 NC |
538 | break; |
539 | default: | |
540 | abort (); | |
541 | } | |
542 | ||
681418c2 | 543 | SKIP_WHITESPACE (); |
987499b2 KT |
544 | if (*input_line_pointer == '%') |
545 | ++input_line_pointer; | |
d02603dc | 546 | name_end = get_symbol_name (& symbol_name); |
604ab327 | 547 | |
987499b2 | 548 | for (i = 0; i < 16; i++) |
681418c2 | 549 | if (! strcasecmp (regs[i], symbol_name)) |
987499b2 | 550 | break; |
604ab327 | 551 | |
d02603dc | 552 | (void) restore_line_pointer (name_end); |
987499b2 | 553 | |
681418c2 RH |
554 | /* Error if register not found, or EAX used as a frame pointer. */ |
555 | if (i == 16 || (kind == 0 && i == 0)) | |
604ab327 | 556 | { |
681418c2 RH |
557 | as_bad (_("invalid register for %s"), directive); |
558 | return -1; | |
604ab327 | 559 | } |
1e17085d | 560 | |
681418c2 | 561 | return i; |
987499b2 KT |
562 | } |
563 | ||
681418c2 RH |
564 | /* Add a register push-unwind token to the current context. */ |
565 | ||
987499b2 | 566 | static void |
681418c2 | 567 | obj_coff_seh_pushreg (int what ATTRIBUTE_UNUSED) |
987499b2 | 568 | { |
681418c2 RH |
569 | int reg; |
570 | ||
bea2c1d7 KT |
571 | if (!verify_context_and_target (".seh_pushreg", seh_kind_x64) |
572 | || !seh_validate_seg (".seh_pushreg")) | |
681418c2 RH |
573 | return; |
574 | ||
575 | reg = seh_x64_read_reg (".seh_pushreg", 1); | |
987499b2 | 576 | demand_empty_rest_of_line (); |
681418c2 RH |
577 | |
578 | if (reg < 0) | |
579 | return; | |
580 | ||
581 | seh_x64_make_prologue_element (UWOP_PUSH_NONVOL, reg, 0); | |
987499b2 KT |
582 | } |
583 | ||
681418c2 RH |
584 | /* Add a register frame-unwind token to the current context. */ |
585 | ||
987499b2 | 586 | static void |
681418c2 | 587 | obj_coff_seh_pushframe (int what ATTRIBUTE_UNUSED) |
987499b2 | 588 | { |
bea2c1d7 KT |
589 | if (!verify_context_and_target (".seh_pushframe", seh_kind_x64) |
590 | || !seh_validate_seg (".seh_pushframe")) | |
681418c2 | 591 | return; |
987499b2 | 592 | demand_empty_rest_of_line (); |
987499b2 | 593 | |
681418c2 | 594 | seh_x64_make_prologue_element (UWOP_PUSH_MACHFRAME, 0, 0); |
987499b2 KT |
595 | } |
596 | ||
681418c2 RH |
597 | /* Add a register save-unwind token to current context. */ |
598 | ||
987499b2 | 599 | static void |
681418c2 | 600 | obj_coff_seh_save (int what) |
987499b2 | 601 | { |
681418c2 RH |
602 | const char *directive = (what == 1 ? ".seh_savereg" : ".seh_savexmm"); |
603 | int code, reg, scale; | |
604 | offsetT off; | |
987499b2 | 605 | |
bea2c1d7 KT |
606 | if (!verify_context_and_target (directive, seh_kind_x64) |
607 | || !seh_validate_seg (directive)) | |
681418c2 | 608 | return; |
987499b2 | 609 | |
681418c2 | 610 | reg = seh_x64_read_reg (directive, what); |
987499b2 | 611 | |
681418c2 RH |
612 | if (!skip_whitespace_and_comma (1)) |
613 | return; | |
987499b2 | 614 | |
681418c2 | 615 | off = get_absolute_expression (); |
987499b2 | 616 | demand_empty_rest_of_line (); |
987499b2 | 617 | |
681418c2 RH |
618 | if (reg < 0) |
619 | return; | |
620 | if (off < 0) | |
987499b2 | 621 | { |
681418c2 | 622 | as_bad (_("%s offset is negative"), directive); |
987499b2 KT |
623 | return; |
624 | } | |
625 | ||
681418c2 | 626 | scale = (what == 1 ? 8 : 16); |
987499b2 | 627 | |
6e0973c0 | 628 | if ((off & (scale - 1)) == 0 && off <= (offsetT) (0xffff * scale)) |
987499b2 | 629 | { |
681418c2 RH |
630 | code = (what == 1 ? UWOP_SAVE_NONVOL : UWOP_SAVE_XMM128); |
631 | off /= scale; | |
987499b2 | 632 | } |
6e0973c0 | 633 | else if (off < (offsetT) 0xffffffff) |
681418c2 RH |
634 | code = (what == 1 ? UWOP_SAVE_NONVOL_FAR : UWOP_SAVE_XMM128_FAR); |
635 | else | |
604ab327 | 636 | { |
681418c2 | 637 | as_bad (_("%s offset out of range"), directive); |
604ab327 NC |
638 | return; |
639 | } | |
681418c2 RH |
640 | |
641 | seh_x64_make_prologue_element (code, reg, off); | |
987499b2 KT |
642 | } |
643 | ||
681418c2 RH |
644 | /* Add a stack-allocation token to current context. */ |
645 | ||
987499b2 | 646 | static void |
681418c2 | 647 | obj_coff_seh_stackalloc (int what ATTRIBUTE_UNUSED) |
987499b2 | 648 | { |
681418c2 RH |
649 | offsetT off; |
650 | int code, info; | |
604ab327 | 651 | |
bea2c1d7 KT |
652 | if (!verify_context_and_target (".seh_stackalloc", seh_kind_x64) |
653 | || !seh_validate_seg (".seh_stackalloc")) | |
681418c2 | 654 | return; |
1e17085d | 655 | |
681418c2 | 656 | off = get_absolute_expression (); |
987499b2 | 657 | demand_empty_rest_of_line (); |
987499b2 | 658 | |
681418c2 RH |
659 | if (off == 0) |
660 | return; | |
661 | if (off < 0) | |
604ab327 | 662 | { |
681418c2 | 663 | as_bad (_(".seh_stackalloc offset is negative")); |
604ab327 NC |
664 | return; |
665 | } | |
987499b2 | 666 | |
681418c2 RH |
667 | if ((off & 7) == 0 && off <= 128) |
668 | code = UWOP_ALLOC_SMALL, info = (off - 8) >> 3, off = 0; | |
6e0973c0 | 669 | else if ((off & 7) == 0 && off <= (offsetT) (0xffff * 8)) |
681418c2 | 670 | code = UWOP_ALLOC_LARGE, info = 0, off >>= 3; |
6e0973c0 | 671 | else if (off <= (offsetT) 0xffffffff) |
681418c2 | 672 | code = UWOP_ALLOC_LARGE, info = 1; |
987499b2 | 673 | else |
604ab327 | 674 | { |
681418c2 | 675 | as_bad (_(".seh_stackalloc offset out of range")); |
604ab327 NC |
676 | return; |
677 | } | |
681418c2 RH |
678 | |
679 | seh_x64_make_prologue_element (code, info, off); | |
987499b2 KT |
680 | } |
681 | ||
681418c2 RH |
682 | /* Add a frame-pointer token to current context. */ |
683 | ||
987499b2 KT |
684 | static void |
685 | obj_coff_seh_setframe (int what ATTRIBUTE_UNUSED) | |
686 | { | |
681418c2 | 687 | offsetT off; |
987499b2 | 688 | int reg; |
987499b2 | 689 | |
bea2c1d7 KT |
690 | if (!verify_context_and_target (".seh_setframe", seh_kind_x64) |
691 | || !seh_validate_seg (".seh_setframe")) | |
681418c2 RH |
692 | return; |
693 | ||
694 | reg = seh_x64_read_reg (".seh_setframe", 0); | |
695 | ||
696 | if (!skip_whitespace_and_comma (1)) | |
697 | return; | |
698 | ||
699 | off = get_absolute_expression (); | |
700 | demand_empty_rest_of_line (); | |
701 | ||
702 | if (reg < 0) | |
703 | return; | |
704 | if (off < 0) | |
705 | as_bad (_(".seh_setframe offset is negative")); | |
706 | else if (off > 240) | |
707 | as_bad (_(".seh_setframe offset out of range")); | |
708 | else if (off & 15) | |
709 | as_bad (_(".seh_setframe offset not a multiple of 16")); | |
710 | else if (seh_ctx_cur->framereg != 0) | |
711 | as_bad (_("duplicate .seh_setframe in current .seh_proc")); | |
712 | else | |
604ab327 NC |
713 | { |
714 | seh_ctx_cur->framereg = reg; | |
715 | seh_ctx_cur->frameoff = off; | |
681418c2 | 716 | seh_x64_make_prologue_element (UWOP_SET_FPREG, 0, 0); |
604ab327 | 717 | } |
987499b2 | 718 | } |
681418c2 RH |
719 | \f |
720 | /* Data writing routines. */ | |
987499b2 | 721 | |
681418c2 | 722 | /* Output raw integers in 1, 2, or 4 bytes. */ |
987499b2 | 723 | |
681418c2 RH |
724 | static inline void |
725 | out_one (int byte) | |
987499b2 | 726 | { |
681418c2 | 727 | FRAG_APPEND_1_CHAR (byte); |
987499b2 KT |
728 | } |
729 | ||
681418c2 RH |
730 | static inline void |
731 | out_two (int data) | |
987499b2 | 732 | { |
681418c2 | 733 | md_number_to_chars (frag_more (2), data, 2); |
987499b2 KT |
734 | } |
735 | ||
681418c2 RH |
736 | static inline void |
737 | out_four (int data) | |
987499b2 | 738 | { |
681418c2 | 739 | md_number_to_chars (frag_more (4), data, 4); |
987499b2 KT |
740 | } |
741 | ||
681418c2 RH |
742 | /* Write out prologue data for x64. */ |
743 | ||
744 | static void | |
745 | seh_x64_write_prologue_data (const seh_context *c) | |
987499b2 | 746 | { |
681418c2 | 747 | int i; |
604ab327 | 748 | |
681418c2 RH |
749 | /* We have to store in reverse order. */ |
750 | for (i = c->elems_count - 1; i >= 0; --i) | |
751 | { | |
752 | const seh_prologue_element *e = c->elems + i; | |
753 | expressionS exp; | |
987499b2 | 754 | |
681418c2 RH |
755 | /* First comes byte offset in code. */ |
756 | exp.X_op = O_subtract; | |
757 | exp.X_add_symbol = e->pc_addr; | |
758 | exp.X_op_symbol = c->start_addr; | |
759 | exp.X_add_number = 0; | |
760 | emit_expr (&exp, 1); | |
987499b2 | 761 | |
681418c2 RH |
762 | /* Second comes code+info packed into a byte. */ |
763 | out_one ((e->info << 4) | e->code); | |
987499b2 | 764 | |
681418c2 | 765 | switch (e->code) |
987499b2 | 766 | { |
681418c2 RH |
767 | case UWOP_PUSH_NONVOL: |
768 | case UWOP_ALLOC_SMALL: | |
769 | case UWOP_SET_FPREG: | |
770 | case UWOP_PUSH_MACHFRAME: | |
771 | /* These have no extra data. */ | |
987499b2 | 772 | break; |
681418c2 RH |
773 | |
774 | case UWOP_ALLOC_LARGE: | |
775 | if (e->info) | |
776 | { | |
777 | case UWOP_SAVE_NONVOL_FAR: | |
778 | case UWOP_SAVE_XMM128_FAR: | |
779 | /* An unscaled 4 byte offset. */ | |
780 | out_four (e->off); | |
781 | break; | |
782 | } | |
783 | /* FALLTHRU */ | |
784 | ||
785 | case UWOP_SAVE_NONVOL: | |
786 | case UWOP_SAVE_XMM128: | |
787 | /* A scaled 2 byte offset. */ | |
788 | out_two (e->off); | |
789 | break; | |
790 | ||
791 | default: | |
792 | abort (); | |
987499b2 | 793 | } |
987499b2 | 794 | } |
987499b2 KT |
795 | } |
796 | ||
681418c2 RH |
797 | static int |
798 | seh_x64_size_prologue_data (const seh_context *c) | |
799 | { | |
800 | int i, ret = 0; | |
801 | ||
802 | for (i = c->elems_count - 1; i >= 0; --i) | |
803 | switch (c->elems[i].code) | |
804 | { | |
805 | case UWOP_PUSH_NONVOL: | |
806 | case UWOP_ALLOC_SMALL: | |
807 | case UWOP_SET_FPREG: | |
808 | case UWOP_PUSH_MACHFRAME: | |
809 | ret += 1; | |
810 | break; | |
987499b2 | 811 | |
681418c2 RH |
812 | case UWOP_SAVE_NONVOL: |
813 | case UWOP_SAVE_XMM128: | |
814 | ret += 2; | |
815 | break; | |
987499b2 | 816 | |
681418c2 RH |
817 | case UWOP_SAVE_NONVOL_FAR: |
818 | case UWOP_SAVE_XMM128_FAR: | |
819 | ret += 3; | |
820 | break; | |
987499b2 | 821 | |
681418c2 RH |
822 | case UWOP_ALLOC_LARGE: |
823 | ret += (c->elems[i].info ? 3 : 2); | |
824 | break; | |
987499b2 | 825 | |
681418c2 RH |
826 | default: |
827 | abort (); | |
828 | } | |
987499b2 | 829 | |
681418c2 | 830 | return ret; |
987499b2 KT |
831 | } |
832 | ||
681418c2 RH |
833 | /* Write out the xdata information for one function (x64). */ |
834 | ||
835 | static void | |
836 | seh_x64_write_function_xdata (seh_context *c) | |
987499b2 | 837 | { |
681418c2 RH |
838 | int flags, count_unwind_codes; |
839 | expressionS exp; | |
987499b2 | 840 | |
681418c2 RH |
841 | /* Set 4-byte alignment. */ |
842 | frag_align (2, 0, 0); | |
987499b2 | 843 | |
681418c2 RH |
844 | c->xdata_addr = symbol_temp_new_now (); |
845 | flags = c->handler_flags; | |
846 | count_unwind_codes = seh_x64_size_prologue_data (c); | |
987499b2 | 847 | |
681418c2 RH |
848 | /* ubyte:3 version, ubyte:5 flags. */ |
849 | out_one ((flags << 3) | 1); | |
987499b2 | 850 | |
681418c2 RH |
851 | /* Size of prologue. */ |
852 | if (c->endprologue_addr) | |
853 | { | |
854 | exp.X_op = O_subtract; | |
855 | exp.X_add_symbol = c->endprologue_addr; | |
856 | exp.X_op_symbol = c->start_addr; | |
857 | exp.X_add_number = 0; | |
858 | emit_expr (&exp, 1); | |
859 | } | |
860 | else | |
861 | out_one (0); | |
987499b2 | 862 | |
681418c2 RH |
863 | /* Number of slots (i.e. shorts) in the unwind codes array. */ |
864 | if (count_unwind_codes > 255) | |
865 | as_fatal (_("too much unwind data in this .seh_proc")); | |
866 | out_one (count_unwind_codes); | |
987499b2 | 867 | |
681418c2 RH |
868 | /* ubyte:4 frame-reg, ubyte:4 frame-reg-offset. */ |
869 | /* Note that frameoff is already a multiple of 16, and therefore | |
870 | the offset is already both scaled and shifted into place. */ | |
871 | out_one (c->frameoff | c->framereg); | |
604ab327 | 872 | |
681418c2 | 873 | seh_x64_write_prologue_data (c); |
987499b2 | 874 | |
681418c2 RH |
875 | /* We need to align prologue data. */ |
876 | if (count_unwind_codes & 1) | |
877 | out_two (0); | |
878 | ||
879 | if (flags & (UNW_FLAG_EHANDLER | UNW_FLAG_UHANDLER)) | |
604ab327 | 880 | { |
681418c2 RH |
881 | /* Force the use of segment-relative relocations instead of absolute |
882 | valued expressions. Don't adjust for constants (e.g. NULL). */ | |
883 | if (c->handler.X_op == O_symbol) | |
884 | c->handler.X_op = O_symbol_rva; | |
885 | emit_expr (&c->handler, 4); | |
604ab327 | 886 | } |
681418c2 RH |
887 | |
888 | /* Handler data will be tacked in here by subsections. */ | |
987499b2 KT |
889 | } |
890 | ||
681418c2 | 891 | /* Write out xdata for one function. */ |
987499b2 KT |
892 | |
893 | static void | |
681418c2 | 894 | write_function_xdata (seh_context *c) |
987499b2 | 895 | { |
681418c2 RH |
896 | segT save_seg = now_seg; |
897 | int save_subseg = now_subseg; | |
898 | ||
899 | /* MIPS, SH, ARM don't have xdata. */ | |
900 | if (seh_get_target_kind () != seh_kind_x64) | |
987499b2 | 901 | return; |
987499b2 | 902 | |
2d7f4929 | 903 | switch_xdata (c->subsection, c->code_seg); |
987499b2 | 904 | |
681418c2 | 905 | seh_x64_write_function_xdata (c); |
1e17085d | 906 | |
681418c2 | 907 | subseg_set (save_seg, save_subseg); |
1e17085d KT |
908 | } |
909 | ||
681418c2 | 910 | /* Write pdata section data for one function (arm). */ |
987499b2 | 911 | |
681418c2 RH |
912 | static void |
913 | seh_arm_write_function_pdata (seh_context *c) | |
987499b2 | 914 | { |
681418c2 RH |
915 | expressionS exp; |
916 | unsigned int prol_len = 0, func_len = 0; | |
917 | unsigned int val; | |
604ab327 | 918 | |
681418c2 RH |
919 | /* Start address of the function. */ |
920 | exp.X_op = O_symbol; | |
921 | exp.X_add_symbol = c->start_addr; | |
922 | exp.X_add_number = 0; | |
923 | emit_expr (&exp, 4); | |
924 | ||
925 | exp.X_op = O_subtract; | |
926 | exp.X_add_symbol = c->end_addr; | |
927 | exp.X_op_symbol = c->start_addr; | |
928 | exp.X_add_number = 0; | |
929 | if (resolve_expression (&exp) && exp.X_op == O_constant) | |
930 | func_len = exp.X_add_number; | |
987499b2 | 931 | else |
681418c2 RH |
932 | as_bad (_(".seh_endproc in a different section from .seh_proc")); |
933 | ||
934 | if (c->endprologue_addr) | |
987499b2 | 935 | { |
681418c2 RH |
936 | exp.X_op = O_subtract; |
937 | exp.X_add_symbol = c->endprologue_addr; | |
938 | exp.X_op_symbol = c->start_addr; | |
939 | exp.X_add_number = 0; | |
940 | ||
941 | if (resolve_expression (&exp) && exp.X_op == O_constant) | |
942 | prol_len = exp.X_add_number; | |
943 | else | |
944 | as_bad (_(".seh_endprologue in a different section from .seh_proc")); | |
987499b2 | 945 | } |
681418c2 RH |
946 | |
947 | /* Both function and prologue are in units of instructions. */ | |
948 | func_len >>= (c->use_instruction_32 ? 2 : 1); | |
949 | prol_len >>= (c->use_instruction_32 ? 2 : 1); | |
950 | ||
951 | /* Assemble the second word of the pdata. */ | |
952 | val = prol_len & 0xff; | |
953 | val |= (func_len & 0x3fffff) << 8; | |
954 | if (c->use_instruction_32) | |
955 | val |= 0x40000000U; | |
956 | if (c->handler_written) | |
957 | val |= 0x80000000U; | |
958 | out_four (val); | |
987499b2 KT |
959 | } |
960 | ||
681418c2 RH |
961 | /* Write out pdata for one function. */ |
962 | ||
987499b2 | 963 | static void |
681418c2 | 964 | write_function_pdata (seh_context *c) |
987499b2 | 965 | { |
681418c2 RH |
966 | expressionS exp; |
967 | segT save_seg = now_seg; | |
968 | int save_subseg = now_subseg; | |
2d7f4929 KT |
969 | memset (&exp, 0, sizeof (expressionS)); |
970 | switch_pdata (c->code_seg); | |
681418c2 RH |
971 | |
972 | switch (seh_get_target_kind ()) | |
987499b2 | 973 | { |
681418c2 RH |
974 | case seh_kind_x64: |
975 | exp.X_op = O_symbol_rva; | |
976 | exp.X_add_number = 0; | |
977 | ||
978 | exp.X_add_symbol = c->start_addr; | |
979 | emit_expr (&exp, 4); | |
2d7f4929 KT |
980 | exp.X_op = O_symbol_rva; |
981 | exp.X_add_number = 0; | |
681418c2 RH |
982 | exp.X_add_symbol = c->end_addr; |
983 | emit_expr (&exp, 4); | |
2d7f4929 KT |
984 | exp.X_op = O_symbol_rva; |
985 | exp.X_add_number = 0; | |
681418c2 RH |
986 | exp.X_add_symbol = c->xdata_addr; |
987 | emit_expr (&exp, 4); | |
988 | break; | |
987499b2 | 989 | |
681418c2 RH |
990 | case seh_kind_mips: |
991 | exp.X_op = O_symbol; | |
992 | exp.X_add_number = 0; | |
987499b2 | 993 | |
681418c2 RH |
994 | exp.X_add_symbol = c->start_addr; |
995 | emit_expr (&exp, 4); | |
996 | exp.X_add_symbol = c->end_addr; | |
997 | emit_expr (&exp, 4); | |
987499b2 | 998 | |
681418c2 RH |
999 | emit_expr (&c->handler, 4); |
1000 | emit_expr (&c->handler_data, 4); | |
604ab327 | 1001 | |
681418c2 RH |
1002 | exp.X_add_symbol = (c->endprologue_addr |
1003 | ? c->endprologue_addr | |
1004 | : c->start_addr); | |
1005 | emit_expr (&exp, 4); | |
1006 | break; | |
987499b2 | 1007 | |
681418c2 RH |
1008 | case seh_kind_arm: |
1009 | seh_arm_write_function_pdata (c); | |
1010 | break; | |
604ab327 | 1011 | |
681418c2 RH |
1012 | default: |
1013 | abort (); | |
987499b2 | 1014 | } |
681418c2 RH |
1015 | |
1016 | subseg_set (save_seg, save_subseg); | |
987499b2 | 1017 | } |